If we are to eliminate carbon emissions and phase out fossil fuels in the coming decades we will have to electrify much of the world (less oil but more copper). We will need to build many more wind turbines (steel, silica and copper) and solar panels (copper and metallurgical silicon), not to mention hydroelectric dams (concrete). But none of this will do the trick unless we have a way of storing that energy. We will need to store it for short periods to deal with the inherent intermittency of renewable sources of energy, such as the sun and the wind. And we will need to store it so that road
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